sched: Fix possible deadlock in tg_set_dynamic_affinity_mode

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7CGD0


CVE: NA

----------------------------------------

Deadlock occurs in two situations as follows:

The first case:

tg_set_dynamic_affinity_mode    --- raw_spin_lock_irq(&auto_affi->lock);
	->start_auto_affintiy   --- trigger timer
		->tg_update_task_prefer_cpus
			>css_task_inter_next
				->raw_spin_unlock_irq

hr_timer_run_queues
  ->sched_auto_affi_period_timer --- try spin lock (&auto_affi->lock)

The second case as follows:

[  291.470810] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[  291.472715] rcu:     1-...0: (0 ticks this GP) idle=a6a/1/0x4000000000000002 softirq=78516/78516 fqs=5249
[  291.475268] rcu:     (detected by 6, t=21006 jiffies, g=202169, q=9862)
[  291.477038] Sending NMI from CPU 6 to CPUs 1:
[  291.481268] NMI backtrace for cpu 1
[  291.481273] CPU: 1 PID: 1923 Comm: sh Kdump: loaded Not tainted 4.19.90+ #150
[  291.481278] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[  291.481281] RIP: 0010:queued_spin_lock_slowpath+0x136/0x9a0
[  291.481289] Code: c0 74 3f 49 89 dd 48 89 dd 48 b8 00 00 00 00 00 fc ff df 49 c1 ed 03 83 e5 07 49 01 c5 83 c5 03 48 83 05 c4 66 b9 05 01 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 ad 07 00 00 0
[  291.481292] RSP: 0018:ffff88801de87cd8 EFLAGS: 00000002
[  291.481297] RAX: 0000000000000101 RBX: ffff888001be0a28 RCX: ffffffffb8090f7d
[  291.481301] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888001be0a28
[  291.481304] RBP: 0000000000000003 R08: ffffed100037c146 R09: ffffed100037c146
[  291.481307] R10: 000000001106b143 R11: ffffed100037c145 R12: 1ffff11003bd0f9c
[  291.481311] R13: ffffed100037c145 R14: fffffbfff7a38dee R15: dffffc0000000000
[  291.481315] FS:  00007fac4f306740(0000) GS:ffff88801de80000(0000) knlGS:0000000000000000
[  291.481318] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  291.481321] CR2: 00007fac4f4bb650 CR3: 00000000046b6000 CR4: 00000000000006e0
[  291.481323] Call Trace:
[  291.481324]  <IRQ>
[  291.481326]  ? osq_unlock+0x2a0/0x2a0
[  291.481329]  ? check_preemption_disabled+0x4c/0x290
[  291.481331]  ? rcu_accelerate_cbs+0x33/0xed0
[  291.481333]  _raw_spin_lock_irqsave+0x83/0xa0
[  291.481336]  sched_auto_affi_period_timer+0x251/0x820
[  291.481338]  ? __remove_hrtimer+0x151/0x200
[  291.481340]  __hrtimer_run_queues+0x39d/0xa50
[  291.481343]  ? tg_update_affinity_domain_down+0x460/0x460
[  291.481345]  ? enqueue_hrtimer+0x2e0/0x2e0
[  291.481348]  ? ktime_get_update_offsets_now+0x1d7/0x2c0
[  291.481350]  hrtimer_run_queues+0x243/0x470
[  291.481352]  run_local_timers+0x5e/0x150
[  291.481354]  update_process_times+0x36/0xb0
[  291.481357]  tick_sched_handle.isra.4+0x7c/0x180
[  291.481359]  tick_nohz_handler+0xd1/0x1d0
[  291.481365]  smp_apic_timer_interrupt+0x12c/0x4e0
[  291.481368]  apic_timer_interrupt+0xf/0x20
[  291.481370]  </IRQ>
[  291.481372]  ? smp_call_function_many+0x68c/0x840
[  291.481375]  ? smp_call_function_many+0x6ab/0x840
[  291.481377]  ? arch_unregister_cpu+0x60/0x60
[  291.481379]  ? native_set_fixmap+0x100/0x180
[  291.481381]  ? arch_unregister_cpu+0x60/0x60
[  291.481384]  ? set_task_select_cpus+0x116/0x940
[  291.481386]  ? smp_call_function+0x53/0xc0
[  291.481388]  ? arch_unregister_cpu+0x60/0x60
[  291.481390]  ? on_each_cpu+0x49/0xf0
[  291.481393]  ? set_task_select_cpus+0x115/0x940
[  291.481395]  ? text_poke_bp+0xff/0x180
[  291.481397]  ? poke_int3_handler+0xc0/0xc0
[  291.481400]  ? __set_prefer_cpus_ptr.constprop.4+0x1cd/0x900
[  291.481402]  ? hrtick+0x1b0/0x1b0
[  291.481404]  ? set_task_select_cpus+0x115/0x940
[  291.481407]  ? __jump_label_transform.isra.0+0x3a1/0x470
[  291.481409]  ? kernel_init+0x280/0x280
[  291.481411]  ? kasan_check_read+0x1d/0x30
[  291.481413]  ? mutex_lock+0x96/0x100
[  291.481415]  ? __mutex_lock_slowpath+0x30/0x30
[  291.481418]  ? arch_jump_label_transform+0x52/0x80
[  291.481420]  ? set_task_select_cpus+0x115/0x940
[  291.481422]  ? __jump_label_update+0x1a1/0x1e0
[  291.481424]  ? jump_label_update+0x2ee/0x3b0
[  291.481427]  ? static_key_slow_inc_cpuslocked+0x1c8/0x2d0
[  291.481430]  ? start_auto_affinity+0x190/0x200
[  291.481432]  ? tg_set_dynamic_affinity_mode+0xad/0xf0
[  291.481435]  ? cpu_affinity_mode_write_u64+0x22/0x30
[  291.481437]  ? cgroup_file_write+0x46f/0x660
[  291.481439]  ? cgroup_init_cftypes+0x300/0x300
[  291.481441]  ? __mutex_lock_slowpath+0x30/0x30

Signed-off-by: Hui Tang <tanghui20@huawei.com>
Reviewed-by: Zhang Qiao <zhangqiao22@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>